Space-heating burner

ABSTRACT

The invention concerns a space-heating burner particularly for furnaces, which produces optimum mixing of the two combustion components, characterized by the fact that the oxidant is stored under pressure in an enclosed space comprising a delivery tube lengthened on the outside by a drip-flap or lip set at a tangent to the outlet, then progressively turned back so that the jet is directed perpendicular to the outlet direction of the delivery tube, a standard type of fuel outlet nozzle being positioned close to this drip-flap in such a way that the oxidant thus injected draws up by suction the carburant forced out of the nozzle, to form a homogenous combustion mixture.

States Ptent Feb. ll, i972 SPACE-HEATING BURNER lnventor: Gerard Pierre Marie-Joseph Dupont,

Chemin des Postes, Sin le Noble (Nord), France Filed: Jan. 26, 1970 App]. No.: 5,716

Foreign Application Priority Date Jan. 30, I969 France .690l978 US. Cl. ..4l31/115,239/DlG. 7 Int. Cl ..F23m 9/00 Field of Search 43l/9, 1 15, 116, 174, 189, 431/l8l;239/DlG.7

References Cited UNITED STATES PATENTS 9/1936 Coanda ..239/DlG. 7

2,990,103 6/1961 Coanda et al. ..239/DIG. 7 3,3l9,692 5/1967 Reba et al 4 ..43l/l 16 3,399,022 8/l968 Bailey .43l/l l6 Primary ExaminerEdward G. Favors Attorney-Brown, Murray, Flick & Peckham [5 7] ABSTRACT The invention concerns a space-heating burner particularly for furnaces, which produces optimum mixing of the two combustion components, characterized by the fact that the oxidam is stored under pressure in an enclosed space comprising a delivery tube lengthened on the outside by a drip-flap or lip set at a tangent to the outlet, then progressively turned back so that the jet is directed perpendicular to the outlet direction of the delivery tube, a standard type of fuel outlet nozzle being positioned close to this drip-flap in such a way that the oxidant thus injected draws up by suction the carburant forced out of the nozzle, to form a homogenous combustion mixture.

2 Claims, 4 Drawing Figures l 1 llllllllllll 1 1 PATENIEU FEB sum 1 nr 2 V SPACE-HEATING BURNER The invention concerns a space-heating burner more particularly, but not exclusively, for brick-making, glassmaking, metallurgy, etc.

With already-existing devices, it is often noted that area are created which are too hot and which are detrimental to the treatment of materials placed within the enclosed space to be heated.

One of the aims of the present invention is to prevent this drawback. It also aims at proposing a material which produces an intense mixture of the components of this combustion and absolute dilution of the mixture within the enclosed space to be heated.

To this end, its object is a space-heating burner producing an optimum mixture of two combustion components, the carburant and the oxidant.

It is characterized by the fact that one of the components is brought, under pressure, to a delivery tube formed by an out let slit to the open air, one edge of which is extended to make a drip-flap which is first of all at a tangent to the exit and then progressively turned back opposite to the other edge of the slit in order to direct the jet, with a standard type outlet nozzle for the other component being provided near to this drip-flap.

The invention will be easily understood with the aid of the description hereafter which constitutes a nonlimiting example with regard to the attached drawings in which:

FIG. I represents an axial section view of a burner in accordance with the invention.

FIG. 2 represents a schematic view of a production variant of this burner.

FIG. 3 represents a schematic view illustrating a particular method of using this burner.

FIG. 4 represents a schematic view of an enclosed space within which is placed the burner in accordance with the invention.

This burner comprises a chamber I made up of a double casing 1 -1 insulated by a layer of thermal insulating material 1 This chamber serves for the storing of a gaseous constituent, preferably the more voluminous one such as, for example, pressurized air, this constituent leaving via a rectilinear or curved slit 2 tangential to a drip-flap or convex lip 3. By means of a well-known physical effect, air follows the convex surface of the drip-flap 3 and adheres strongly to it, leaving it at a definite tangent to its end 3,. This rapid deviation of the jet of air and the attendant turbulences cause a strong suction current.

As this drip-flap is in the present case positioned within a furnace (not shown), the jet of air will draw along with it a considerable proportion of the surrounding furnace atmosphere.

A nozzle 4 positioned near to the drip-flap 3 will thus enable the combustible injected into it (gas or atomized liquid) to be mixed with this jet. The jet will then comprise the combustible, the oxidant, with part of the furnace atmosphere thus adding the calories which facilitate firing of the whole and a mass sufficient to dilute them afterwards and avoid too hot a flame.

The kinetic energy of the driving element (compressed air in the present case) thus serves to suck up the furnace atmosphere all around the flame jet and to direct it by means of the drip-plate 3 in a beam diverging mostly in the direction F indicated.

In a preferred method the combustible serves as atomized fuel, the oxidant as air or oxygen. This allows the use of relatively powerful burners without risk of the products being locally overheated by the flame, in the case offiring or reheating products sensitive to differences in temperature (ceramics, terra-cotta, etc.). But it is also possible to use the directed conveyance effect of calories to reheat fiercely a mass of any substance whatsoever, say metal, by directing, for example, the jet of gas onto smelting iron from a Martin furnace or to reheat forging tools.

A particular method of using this burner in a ceramic-liring oven is shown in FIG. 4. In this oven of a type already known, atomized fuel burned badly, on the one hand because of the lack of oxygen and on the other hand because the fuel was slow to ignite. Use of the burner forming the object ofthis invention allows this upper volume to be swept by a hot gas jet and in addition prevents the dangerous effects of too hot a flame.

FIG. 2 shows a gas burner with a radiating flame. In this burner, only part of the oxidant air is admitted into a chamber 1 and the gaseous fuel via a tube 4. The jet of the mixture so produced follows the flat surface 6 of the piping 7 and can be ignited there. Due to lack of oxygen, the incomplete combustion of the gases produces fine carbon particles. The piping 7 leads the superfluous oxidant to the nozzle 2 terminating in the drip-flap 3. The incompletely burned mixture suddenly mixing again with extra air then provides a radiating flame.

In the case of FIG. 3, a similar process is used to reoxygenate a reducing flame. A burner of the first type described is regulated as a reducer for needs of ambiance. In order to complete combustion further away, the lacking oxidant is reincorporated via an injector 8 of the same type blowing axially to thejet by means of the drip'flap 3. The intense mixture of the twojets A and B will allow combustion to be completed.

It is obvious that the invention is not limited to the examples described and represented above; from these it is possible to foresee other forms and production methods which in no way exceed the compass of this invention.

What is claimed is:

l. A burner especially for a furnace for heating products such as ceramics, terra-cotta or the like, the burner comprising an oxidant delivery tube having an outlet with a deflecting convex lip for directing oxidant tangentially to the outlet, the burner being characterized in that it comprises two chambers and a nozzle, one of said chambers being an oxidant chamber communicating with the inlet of said delivery tube, and the other of said chambers being a fuel chamber communicating with the inlet of said nozzle, said delivery tube outlet being a rectilinear slit and the nozzle outlet being located near said deflecting lip of the delivery tube so that oxidant issuing from said slit will draw in surrounding atmosphere of the furnace and mix with fuel issuing from the nozzle in order to produce a jet directed in a path substantially parallel to the direction of the deflecting lip.

2. A burner as defined in claim 1, characterized by the fact that a second oxidant delivery tube having an outlet with a deflecting convex lip is located beside said jet path for adding oxidant to said jet. 

1. A burner especially for a furnace for heating products such as ceramics, terra-cotta or the like, the burner comprising an oxidant delivery tube having an outlet with a deflecting convex lip for directing oxidant tangentially to the outlet, the burner being characterized in that it comprises two chambers and a nozzle, one of said chambers being an oxidant chamber communicating with the inlet of said delivery tube, and the other of said chambers being a fuel chamber communicating with the inlet of said nozzle, said delivery tube outlet being a rectilinear slit and the nozzle outlet being located near said deflecting lip of the delivery tube so that oxidant issuing from said slit will draw in surrounding atmosphere of the furnace and mix with fuel issuing from the nozzle in order to produce a jet directed in a path substantially parallel to the direction of the deflecting lip.
 2. A burner as defined in claim 1, characterized by the fact that a second oxidant delivery tube having an outlet with a deflecting convex lip is located beside said jet path for adding oxidant to said jet. 